Insist on objective criteria

Anchor the deal to independent standards — market rates, precedent, expert opinion — not willpower.

Why it works

When agreement rests on whose will is stronger, both sides dig in and the relationship pays. Grounding terms in a fair external standard converts a contest of stubbornness into a joint search for the right answer, and gives both parties a face-saving reason to move.

How to do it

1. Before negotiating, gather legitimate standards: market data, precedents, professional norms.
2. Frame your proposal as an application of a fair standard, and ask which standard they’d accept.
3. Yield to principle and reason, never to pressure.

Evidence

A central Harvard-method principle. Anchoring agreement to shared external standards is consistent with fairness and procedural-justice research, but the principle is framework guidance. (mechanistic)

Effectiveness depends on a standard both sides see as legitimate; where none exists, this lever weakens.

Common mistake

Letting it become a willpower contest, where the more stubborn party "wins" the number but loses goodwill and future deals.